What Are the Steps to Sue a Business in Arizona?

Step 1: Send a Demand Letter

Most well-run business disputes start with a demand letter, not a complaint. It puts the other side on formal notice, sometimes triggers a contractual or statutory prerequisite to suit, and gives both sides a real chance to resolve the dispute without the cost of litigation.

A demand letter also does real strategic work beyond the chance of an early resolution. It creates a clear paper-trail record of when the other side was put on notice, and it often forces a more serious response than an informal conversation would, since it signals litigation is a genuine possibility, not just a frustrated complaint.

Step 2: Choose the Right Court

Arizona splits civil cases by dollar amount and complexity. Smaller claims often belong in Justice Court, mid-size disputes may go to Small Claims (which caps damages and does not allow attorneys to appear for most parties), and larger or more complex commercial disputes belong in Superior Court, which has no damages cap and allows full discovery. Choosing the wrong court can mean refiling and losing time.

Beyond the dollar amount, complexity matters too. A straightforward unpaid invoice claim may be well suited to a lower court’s faster, simpler process, while a dispute involving multiple parties, contested liability, or significant damages generally needs Superior Court’s full discovery and motion practice to be properly developed and proven.

Step 3: File and Serve the Complaint

The lawsuit formally begins when a complaint is filed with the court, laying out the claims, the facts supporting them, and the relief sought. Arizona law requires the defendant business to be properly served with the complaint and a summons, which for a company usually means serving a statutory agent or an authorized officer, not just anyone at the business.

Getting service right matters more than most people expect. Improper service can delay a case for weeks or months while it is corrected, and in some situations can be used by the defendant to challenge the court’s authority over them entirely, which is why this step is rarely something to handle informally.

Step 4: The Business Responds

Once served, the defendant business generally has 20 days (or 30 days if served outside Arizona) to file an answer or a motion to dismiss. An answer responds to each allegation and typically raises any defenses the business intends to argue.

A motion to dismiss, rather than an answer, argues that even taking the plaintiff’s allegations as true, there is some legal reason the case cannot proceed, an expired statute of limitations or a fundamental pleading defect, for example. If it is denied, the defendant generally must still file an answer and the case moves forward.

Step 5: Discovery

Discovery is where most of the real work happens. Both sides exchange documents, answer written questions (interrogatories), and take depositions of witnesses and company representatives under oath. This phase often reveals whether a case is strong enough to justify trial, or whether settlement makes more sense.

Discovery typically includes requests for production (documents), interrogatories (written questions answered under oath), requests for admission (asking the other side to admit or deny specific facts), and depositions (live, recorded testimony). Each tool serves a different purpose, and how thoroughly discovery is conducted often directly determines how a case ultimately resolves.

Step 6: Motions

Before trial, either side can ask the court to resolve issues, or the entire case, without a trial. A motion for summary judgment argues there is no genuine factual dispute and the moving party is entitled to win as a matter of law. These motions can end a case early or narrow what actually goes to trial.

Motion practice can also address narrower issues along the way, what evidence will be admissible, whether certain claims or defenses should be dismissed, or procedural disputes between the parties. A well-timed motion can meaningfully shift settlement leverage even without ending the case outright.

Step 7: Settlement or Trial

The large majority of business disputes settle before trial, often after discovery makes each side’s position clear. If the case does not settle, it proceeds to trial, where a judge or jury decides the outcome based on the evidence presented.

Settlement can happen at any point, before filing, during discovery, right up until a verdict, and often reflects how strong each side’s case has turned out to be once the facts are fully developed. Cases prepared as if they will genuinely go to trial tend to produce the strongest settlements, since the other side has real reason to take the threat seriously.

What to Expect in Terms of Cost and Timeline

Costs and timelines vary enormously based on the court, the complexity of the dispute, and how far the case proceeds before resolving. A straightforward Justice Court claim can resolve in a few months for a modest cost. A complex Superior Court commercial dispute involving full discovery, expert witnesses, and motion practice can take a year or more and cost significantly more, though Arizona’s fee-shifting statute for contract claims, A.R.S. § 12-341.01, can meaningfully change that calculus for the prevailing party.

Justice Court vs. Superior Court for Business Disputes